Comment 16 for bug 376715

Sorry for the bug spam but I figure people might be interested in an interim
solution. There is freeware application called trayit that lets you minimize
any application to the taskbar by right-clicking the close button. This gives
you the best of both worlds in that you can choose to minimize to taskbar,
minimize to tray, or close the application. http://www.teamcti.com/trayit/trayit.htm

It only works on windows, it doesn't give any application options while
minimized and it doesn't reduce the memory footprint...but it's a start.